Hey guys, first post here, but I've already learned a lot from this site, so thanks!
I've recently picked up a couple old analog hitachi oscilloscopes on Craigslist. Models V-134 and V-152 F to be specific. They're both at least semi operational, as shown in the following pic:
They both have some finicky spots in various knobs that affect and distort the displayed waveform, with the 134 being quite a bit worse. I've been able to coax a proper signal out of them in most settings, but some can be pretty unreliable. I've read that cleaning the switch contacts should help this situation, could anyone suggest a proper cleaner? Is there anything else I should be looking at?
Considering I'll have to open the case, I'd also like to be sure I've discharged all the caps and deenergized anything else that may need it. Is there anything special I need to do to accomplish this? Just turn the intensity (power) switch on with the unit unplugged?
Also, the 152 came with a copy of the operation manual, but that's all the documentation I have. Does anyone know if service manuals for them exist somewhere on the web? I've looked, but come up empty so far.
Just out of curiosity, I searched for the date these scopes would have been made, but I've come up dry there as well. There doesn't seem to be much information about these things out there, at least not that I can find.
Thanks in advance, and please let me know if I need to provide any further information. This isn't my first time working on electronics, but definitely my first time working on anything like this
I've recently picked up a couple old analog hitachi oscilloscopes on Craigslist. Models V-134 and V-152 F to be specific. They're both at least semi operational, as shown in the following pic:
They both have some finicky spots in various knobs that affect and distort the displayed waveform, with the 134 being quite a bit worse. I've been able to coax a proper signal out of them in most settings, but some can be pretty unreliable. I've read that cleaning the switch contacts should help this situation, could anyone suggest a proper cleaner? Is there anything else I should be looking at?
Considering I'll have to open the case, I'd also like to be sure I've discharged all the caps and deenergized anything else that may need it. Is there anything special I need to do to accomplish this? Just turn the intensity (power) switch on with the unit unplugged?
Also, the 152 came with a copy of the operation manual, but that's all the documentation I have. Does anyone know if service manuals for them exist somewhere on the web? I've looked, but come up empty so far.
Just out of curiosity, I searched for the date these scopes would have been made, but I've come up dry there as well. There doesn't seem to be much information about these things out there, at least not that I can find.
Thanks in advance, and please let me know if I need to provide any further information. This isn't my first time working on electronics, but definitely my first time working on anything like this